[OSM-dev] tiles tiles tiles

[Raphaël Jacquot]

Jon Burgess wrote:
> On Wed, 2006-11-29 at 21:23 +0000, SteveC wrote:
>> Using a bugfixed version of almiens tilecount.pl (which figures out what
>> tiles actually have map data on them), I've written a script to render
>> them (from zoom 0-18).
> 
> I believe there are a couple of edge cases which we may need to
> consider. 
> 
> 1) Way segements which cross a tile even though the nodes are no nodes
> inside, e.g.
> 
>    ------
>   |      |
> +-----------+
>   |      |
>    ------

this is handled by the postgis operators

> 2) Text labels and icons which extend beyond the edge of the tile containing the node 
> 
>  ------- -------
> |       |       |
> |   *City-Name  |
> |       |       |
>  ------- -------
> 
> Perhaps we need to ensure the 8 surrounding tiles of and on the list is also rendered.
> In many cases these tiles will already have nodes so the overall increase in the number
> of tiles to be rendered may not be as big as first appears.

if you look at the python program, it renders on a 512x512 tile and cuts 
out the sides to keep a 256x256 center

> 	Jon
> 
> 
> 
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